That arm that you pull to brighten or dim is connected to dimmer switch/multifunction switch.
Disconnect the negative battery cable.
Disable the airbag.
Remove the steering wheel.
Remove the steering column trim covers.
Remove the 2 torque head screws from the multifunction switch.
Remove the multifunction switch.

There is a safety issue because of the airbag. Safety is your responsibility. You will also probably need a steering wheel puller. You have to decide if this something you want to tackle?